Closed removable needle bearing



May 14, 1935.

-G. EISGRUBER CLOSED REMOVABLE NEEDLE BEARING Filed Alig 27, 1932Patented May 14, 1935 I v 2,001,675

UNITED STATES PATENT OFFICE 2,001,675 CLOSED REMOVABLE NEEDLE BEARINGeorg Eisgruber, Nuremberg, Germany Application August 27, 1932, SerialNo. 630,683 In Germany May 15, 1931 4 Claims. (Cl. 308-236) Thisinvention relates to a closed removable any time as is often necessary,it 'being particuneedle bearing especially for use as transmission larlynoted that the clamping elements can be bearing and as bearing forcylinders and pairs of tightened and loosened from the outer side.cylinders on rolling mills by the construction of Two embodiments of theinvention are illus- 5 which it is possible to employ the needlebearings trated byway of example in the accompanying 5 which are verysensitive to bending. drawing in which:--

The needle bearing according to the invention Fig. 1 shows an axialsection of a transmission is characterized in that from a rigidsupporting bearing. I hub "known split cones extend step-like on oneFig. 2 is an axial section through a slip-in or or both sides, annulargrooves being provided at flanged bearing for rolling mills or similarma.- 10

the point of junction so that no bending moments chines.

can be transmitted to the bearing part of the The needle bearingaccording to the invention supporting hub when tightening the clampingconsists substantially of a supporting element (1, nuts. This supportingpart is therefore absoon one or both sides of which split clamping cones5 lutely free from bending stresses and distortion so b are arrangedaccording to the purpose of use. that the long needles, which are verysensitive to In the case oi transmission bearings (Fig. 1), in bending,can be employed which, as is known, w h t v ry high pressures u the wcan only be used where binding and therefore sided arrange t 0! e c mpGe b is distortions of the bearing cannot occur. p e ably Chosen, which001185 radially fi the As compared with the known ball or roller bearingin a perfect a ne In Order to p bearings, the advantage is derived bythis type Vent the bending o ents, occurring durin the of bearing, thatit can also be used when it is clamping, being smitted t th supp tstrongly stressed as regards shocks. Further, the element a, the supp ubas at h poi ts bearing is of very small dimensions and can be ofjunction of the c a p c nes two annular substituted for any ringlubricating bearing. grooves e d the clamping n s ar j t step-Consequently, all the advantages of the needle like to the suppel'tihgelements, e suphearing are utilized to best advantage for transportingelement a is therefore held free from mission bearings and bearings forthe cylinders Stresses and distertien- The supporting element in rollingp1 a itself may be hardened and serve as race for When a split clampingcone is arranged only needles d Special 038% 30 on one side, in the caseof slip-in or flanged The i beanng element 8 is fixed by means bearings,for example bearings on rolling mills of Pressure Tings f and clampingrings 9 these and similar machines, it is advisable to arrange ringsSerf/mg at the same time as guide for an annular flange opposite theannular groove, the

so that this annular flange in any case avoids The clamping nuts 9 areextended beyond the 35 t transmission of any supplementary presclampingcones b in such a. manner that the flaps sure onto the supporting partof the hub when 3 engage the clamping cones Thus, in the tightening theclamping cone. At the same time case of excessive tightening o the tuffibox.

- certain rigidity is imparted to the supporting the lubricant will notescape through the slits of 40 part, this being particularly importantin the case the clamping cones v of-the shocks which occur in rollingmills and Therefore, contrary to all known construesimilar machinestions, special guide bearings are omitted, which In the ca oftransmission bearings these fact represents a considerablesimplification 'of shook pressures do not occur, that in this thebearing according to the invention from a stance the radial fixing ofthe middle supporting manufacturing Point 0 Vi w. e pr ure and 45 partby means of clamping cones arranged on Clamping rings e moreoverProvided with yt sides is preferable rinth passages 72. or diflerentdepths, so that at The freedom from stressing and distortion is the Sametime an absolutely o -D ensured by the annular groove and the stepped pcking is ensured W fi ng the n The 60 junction of the clamping cones onthesupportbearing element can be dispatched thus closed, ing part. whichis extremely important in the case of The individual parts of thebearing, such as transmission bearings owing to the danger of clampingnuts, pressure andsupporting ring and soiling; so forth, interengagelabyrinth-like, so that the As above mentioned, it is also possible tofix hearing can be removed closed and dust-tight at the bearing on bothsides. The, bearing, for example where the bearings must be flanged onor slipped-in as in rolling mills and other machines, must be providedwith only one clamping cone b, and an annular flange k is arrangedopposite the annular groove 0, which flange forms a unit with thesupporting element a and the clamping cone b. This annular flange servesfor imparting greater strength to the supporting hub and to enable thetightening of the clamping ring 1 by means of screws m. It is evidentthat for the clamping ring m a clamping nut may be substituted. Betweenthe supporting ring e and the supporting element a a needle bearing ismounted, the inner ring 01 of which, in the case of the expansion andalso of the guide bearing, is fixed axially against the shoulders of thebearing supporting ring e and against the cylindrical supporting elementa by the small pressure ring I and its outer ring by the large pressurering p. The screws m have each a collar 0 which automatically opens theclamping ring I when the screws m are unscrewed. A catch disc 1- isarranged on the supporting ring e so that the entire bearing can beremoved with the machine frame after the clamping hub and the screwconnection have been loosened. Further the annular flange, thesupporting and pressure rings in this instance also interengage inlabyrinth fashion so that an absolutely closed 011 and dust-proofbearing element is produced.

The essential advantages of the invention are based on the facts thatthe supporting element a of the hub is held absolutely free fromstressing and distortion by means of the annular grooves and so forth,and that the clamping and supporting elements are at the same timepacking elements so that the very advantageous needle bearing can beemployed for new purposes in the construction of transmissions, rollingmills and so forth.

Further, by the employment of needles, the

dimensions of the bearings can be made smaller,

this being particularly important in the building of rolling mills andwhere in the case of pairs of bearings compactness is necessary, as onlylimited space is available for the bearings. Moreover, owing to theconstruction, a simplification of the manufacture is ensured and suchneedle bearings may be regarded as universal bearings, especiallybecause any known bearing can be replaced by a needle bearing accordingto the invention. A particular advantage consists in the fact that thebearing can be fitted and removed inclosed condition and can thereforebe also dispatched in closed condition. Consequently, the

delicate needles are no longer liable to become soiled as heretofore.

I claim:-

1. In a closed removable needle bearing a supporting hub, comprising arigid supporting ring and a resilient cone at least on one side of saidsupporting ring having an annular recess in its inner surface directlyadjacent said supporting ring.

2. A supporting hub for removable needle bearings as specified in claim1 in which a resilient cone extends from each side of the rigidsupporting ring, two annular recesses being provided one in the innersurface of each of said cones directly adjacent the supporting ring.

3. A supporting hub for removable needle bearings, as specified in claim1, in which a cone extends i'rom one side of the rigid supporting ringand has in its inner surface an annular groove directly adjacent thesupporting ring.. said ring having on its outer surface a flangeapproximately opposite the annular groove.

4. A supporting hub for removable needle bearings as specified in claim1, in which the outer surface of the rigid supporting ring is hardenedand serves directly as running surface forthe needles without cage.

GEORG EISGRUBER;

